Abstract—We consider a wireless sensor network where
nodes are randomly distributed in a geographic region. These
nodes are battery operated. We assume that these nodes can
fail at any time after deployment. These failures may cause
shortage of nodes and hence various disability in the network.
To overcome this we consider a multiphase wireless sensor
network. In such a network, nodes are periodically re-deployed
to ensure the connectivity of the network. In this article, we
give the analytical results for the number of nodes re-deploy at
each generation and average age of a node picked at random
from the network. We also gives the condition for that an
active link is not compromised when a number of nodes has
been compromised.